Please use 25AA640A or 25LC640A....

25AA640/25LC64064K SPI Bus Serial EEPROM

Not recommended for new designs –Please use 25AA640A or 25LC640A.

Device Selection Table

Features:• Low-Power CMOS Technology

- Write current: 3 mA, typical- Read current: 500 μA, typical- Standby current: 500 nA, typical

• 8192 x 8 Bit Organization• 32 Byte Page• Write Cycle Time: 5 ms max.• Self-Timed Erase and Write Cycles• Block Write Protection

- Protect none, 1/4, 1/2 or all of array• Built-in Write Protection

- Power on/off data protection circuitry- Write enable latch- Write-protect pin

• Sequential Read• High Reliability

- Data retention: > 200 years- ESD protection: > 4000V

• 8-pin PDIP, SOIC and TSSOP Packages• Temperature Ranges Supported:

- Industrial (I): -40°C to +85°C- Automotive (E): -40°C to +125°C

Description:The Microchip Technology Inc. 25AA640/25LC640(25XX640*) is a 64 Kbit Serial Electrically ErasablePROM [EEPROM]. The memory is accessed via asimple Serial Peripheral Interface (SPI) compatibleserial bus. The bus signals required are a clock input(SCK) plus separate data in (SI) and data out (SO)lines. Access to the device is controlled through a ChipSelect (CS) input.

Communication to the device can be paused via thehold pin (HOLD). While the device is paused,transitions on its inputs will be ignored, with theexception of Chip Select, allowing the host to servicehigher priority interrupts.

Block Diagram

Package Types

PartNumber

VCCRange

Max ClockFrequency

TempRanges

25AA640 1.8-5.5V 1 MHz I25LC640 2.5-5.5V 2 MHz I25LC640 4.5-5.5V 3/2.5 MHz I, E

SI

SO

SCK

CS

HOLD

WP

I/O ControlMemoryControlLogic

HV Generator

EEPROM

Array

Page

Y Decoder

Sense Amp.R/W Control

Logic

VCCVSS

Latches

XDEC

STATUSRegister

25XX

640

25XX

640

PDIP/SOICTSSOP

CS

SO

WP

VSS

VCC

HOLD

SCK

SI

8

7

6

5

1

2

3

4

8765

1234

HOLDVCCCSSO

SCKSIVSS

WP

*25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices.

© 2008 Microchip Technology Inc. DS21223H-page 1

25AA640/25LC640

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings(†)

VCC.............................................................................................................................................................................7.0V

All inputs and outputs w.r.t. VSS ........................................................................................................ -0.6V to VCC + 1.0V

Storage temperature .................................................................................................................................-65°C to 150°C

Ambient temperature under bias ...............................................................................................................-65°C to 125°C

ESD protection on all pins ..........................................................................................................................................4 kV

TABLE 1-1: DC CHARACTERISTICS

† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to thedevice. This is a stress rating only and functional operation of the device at those or any other conditions above thoseindicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for anextended period of time may affect device reliability.

DC CHARACTERISTICS Industrial (I): TA = -40°C to +85°C VCC = 1.8V to 5.5VAutomotive (E): TA = -40°C to +125°C VCC = 4.5V to 5.5V

Param.No. Sym Characteristics Min Max Units Conditions

D1 VIH1 High-level input voltage

2.0 VCC + 1 V VCC ≥ 2.7V (Note 1)D2 VIH2 0.7 VCC VCC + 1 V VCC < 2.7V (Note 1)D3 VIL1 Low-level input

voltage-0.3 0.8 V VCC ≥ 2.7V (Note 1)

D4 VIL2 -0.3 0.2 VCC V VCC < 2.7V (Note 1)D5 VOL Low-level output

voltage— 0.4 V IOL = 2.1 mA— 0.2 V IOL = 1.0 mA, VCC = < 2.5V

D6 VOH High-level output voltage

VCC - 0.5 — V IOH = -400 μA

D7 ILI Input leakage current — ±1 μA CS = VCC, VIN = VSS TO VCC

D8 ILO Output leakage current

— ±1 μA CS = VCC, VOUT = VSS TO VCC

D9 CINT Internal Capacitance(all inputs and outputs)

— 7 pF TA = 25°C, CLK = 1.0 MHz,VCC = 5.0V (Note 1)

D10 ICC Read Operating Current ——

1500

mAμA

VCC = 5.5V; FCLK = 3.0 MHz; SO = OpenVCC = 2.5V; FCLK = 2.0 MHz; SO = Open

D11 ICC Write ——

53

mAmA

VCC = 5.5VVCC = 2.5V

D12 ICCS Standby Current ——

51

μAμA

CS = VCC = 5.5V, Inputs tied to VCC or VSSCS = VCC = 2.5V, Inputs tied to VCC or VSS

Note 1: This parameter is periodically sampled and not 100% tested.

DS21223H-page 2 © 2008 Microchip Technology Inc.

25AA640/25LC640
TABLE 1-2: AC CHARACTERISTICS
AC CHARACTERISTICS Industrial (I): TA = -40°C to +85°C VCC = 1.8V to 5.5VAutomotive (E): TA = -40°C to +125°C VCC = 4.5V to 5.5V

Param.No. Sym Characteristic Min Max Units Conditions

1 FCLK Clock Frequency ———

321

MHzMHzMHz

VCC = 4.5V to 5.5V (Note 2)VCC = 2.5V to 5.5VVCC = 1.8V to 5.5V

2 TCSS CS Setup Time 100250500

———

nsnsns

VCC = 4.5V to 5.5VVCC = 2.5V to 5.5VVCC = 1.8V to 5.5V

3 TCSH CS Hold Time 150250475

———

nsnsns


4 TCSD CS Disable Time 500 — ns5 TSU Data Setup Time 30

5050

———

nsnsns


6 THD Data Hold Time 50100100

———

nsnsns


7 TR CLK Rise Time — 2 μs (Note 1)8 TF CLK Fall Time — 2 μs (Note 1)9 THI Clock High Time 150

230475

———

nsnsns


10 TLO Clock Low Time 150230475

———

nsnsns


11 TCLD Clock Delay Time 50 — ns12 TCLE Clock Enable Time 50 — ns13 TV Output Valid from

Clock Low———

150230475

nsnsns


14 THO Output Hold Time 0 — ns (Note 1)15 TDIS Output Disable Time —

——

200250500

nsnsns

VCC = 4.5V to 5.5V (Note 1)VCC = 2.5V to 5.5V (Note 1)VCC = 1.8V to 5.5V (Note 1)

16 THS HOLD Setup Time 100100200

———

nsnsns


17 THH HOLD Hold Time 100100200

———

nsnsns


18 THZ HOLD Low to Output High-Z

100150200

———

nsnsns

VCC = 4.5V to 5.5V (Note 1)VCC = 2.5V to 5.5V (Note 1)VCC = 1.8V to 5.5V (Note 1)

19 THV HOLD High to Output Valid

100150200

———

nsnsns


20 TWC Internal Write Cycle Time

— 5 ms

21 — Endurance 1M — E/W Cycles

(Note 3)

Note 1: This parameter is periodically sampled and not 100% tested.2: FCLK max. = 2.5 MHz for TA > 85°C.3: This parameter is not tested but established by characterization. For endurance estimates in a specific application,

please consult the Total Endurance™ Model which can be obtained from Microchip’s web site at: www.microchip.com.


25AA640/25LC640
FIGURE 1-1: HOLD TIMING
FIGURE 1-2: SERIAL INPUT TIMING

FIGURE 1-3: SERIAL OUTPUT TIMING

CS

SCK

SO

SI

HOLD

1716 16 17

1918

Don’t Care5

High-Impedancen + 2 n + 1 n n - 1n

n + 2 n + 1 n n n - 1

CS

SCK

SI

SO

65

87 11

3

LSB InMSB In

High-Impedance

12

Mode 1,1

Mode 0,0

4

2

CS

SCK

SO

109

13

MSB Out LSB Out

3

15

Don’t CareSI

Mode 1,1

Mode 0,0

14


25AA640/25LC640
TABLE 1-3: AC TEST CONDITIONS FIGURE 1-4: AC TEST CIRCUITAC Waveform:
VLO = 0.2V

VHI = VCC – 0.2V (Note 1)VHI = 4.0V (Note 2)

Timing Measurement Reference LevelInput 0.5 VCC

Output 0.5 VCC

Note 1: For VCC ≤ 4.0V

2: For VCC > 4.0V

VCC

SO

100 pF1.8 kΩ

2.25 kΩ


25AA640/25LC640

2.0 PIN DESCRIPTIONSThe descriptions of the pins are listed in Table 2-1.

TABLE 2-1: PIN FUNCTION TABLE

2.1 Chip Select (CS)A low level on this pin selects the device. A high leveldeselects the device and forces it into Standby mode.However, a programming cycle which is alreadyinitiated or in progress will be completed, regardless ofthe CS input signal. If CS is brought high, or remainshigh during a program cycle, the device will go intoStandby mode when the programming cycle iscomplete. When the device is deselected, SO goes tothe high-impedance state, allowing multiple parts toshare the same SPI bus. A low-to-high transition on CSafter a valid write sequence initiates an internal writecycle. After power-up, a high-to-low transition on CS isrequired prior to any sequence being initiated.

2.2 Serial Output (SO)The SO pin is used to transfer data out of the 25XX640.During a read cycle, data is shifted out on this pin afterthe falling edge of the serial clock.

2.3 Write-Protect (WP)This pin is used in conjunction with the WPEN bit in theSTATUS register to prohibit writes to the nonvolatilebits in the STATUS register. When WP is low andWPEN is high, writing to the nonvolatile bits in the STA-TUS register is disabled. All other operations functionnormally. When WP is high, all functions, includingwrites to the nonvolatile bits in the STATUS registeroperate normally. If the WPEN bit is set, WP low duringa STATUS register write sequence will disable writingto the STATUS register. If an internal write cycle hasalready begun, WP going low will have no effect on thewrite.

The WP pin function is blocked when the WPEN bit inthe STATUS register is low. This allows the user toinstall the 25XX640 in a system with WP pin groundedand still be able to write to the STATUS register. TheWP pin functions will be enabled when the WPEN bit isset high.

2.4 Serial Input (SI)The SI pin is used to transfer data into the device. Itreceives instructions, addresses, and data. Data islatched on the rising edge of the serial clock.

2.5 Serial Clock (SCK)The SCK is used to synchronize the communicationbetween a master and the 25XX640. Instructions,addresses, or data present on the SI pin are latched onthe rising edge of the clock input, while data on the SOpin is updated after the falling edge of the clock input.

2.6 Hold (HOLD)The HOLD pin is used to suspend transmission to the25XX640 while in the middle of a serial sequence with-out having to retransmit the entire sequence overagain. It must be held high any time this function is notbeing used. Once the device is selected and a serialsequence is underway, the HOLD pin may be pulledlow to pause further serial communication withoutresetting the serial sequence. The HOLD pin must bebrought low while SCK is low, otherwise the HOLDfunction will not be invoked until the next SCK high-to-low transition. The 25XX640 must remain selectedduring this sequence. The SI, SCK, and SO pins are ina high-impedance state during the time the device ispaused and transitions on these pins will be ignored. Toresume serial communication, HOLD must be broughthigh while the SCK pin is low, otherwise serialcommunication will not resume. Lowering the HOLDline at any time will tri-state the SO line.

Name PDIP SOIC TSSOP Description

CS 1 1 3 Chip Select Input

SO 2 2 4 Serial Data Output

WP 3 3 5 Write-Protect Pin

VSS 4 4 6 Ground

SI 5 5 7 Serial Data Input

SCK 6 6 8 Serial Clock Input

HOLD 7 7 1 Hold Input

VCC 8 8 2 Supply Voltage


25AA640/25LC640

3.0 FUNCTIONAL DESCRIPTION

3.1 Principles Of OperationThe 25XX640 is a 8192 byte Serial EEPROM designedto interface directly with the Serial Peripheral Interface(SPI) port of many of today’s popular microcontrollerfamilies, including Microchip’s PIC16C6X/7X micro-controllers. It may also interface with microcontrollersthat do not have a built-in SPI port by using discreteI/O lines programmed properly with the software.

The 25XX640 contains an 8-bit instruction register. Thedevice is accessed via the SI pin, with data beingclocked in on the rising edge of SCK. The CS pin mustbe low and the HOLD pin must be high for the entireoperation.

Table 3-1 contains a list of the possible instructionbytes and format for device operation. All instructions,addresses, and data are transferred MSB first, LSBlast.

Data is sampled on the first rising edge of SCK after CSgoes low. If the clock line is shared with otherperipheral devices on the SPI bus, the user can assertthe HOLD input and place the 25XX640 in ‘HOLD’mode. After releasing the HOLD pin, operation willresume from the point when the HOLD was asserted.

3.2 Read SequenceThe device is selected by pulling CS low. The 8-bitREAD instruction is transmitted to the 25XX640 fol-lowed by the 16-bit address with the three MSBs of theaddress being “don’t care” bits. After the correct READinstruction and address are sent, the data stored in thememory at the selected address is shifted out on theSO pin. The data stored in the memory at the nextaddress can be read sequentially by continuing to pro-vide clock pulses. The internal Address Pointer is auto-matically incremented to the next higher address aftereach byte of data is shifted out. When the highestaddress is reached (1FFFh), the address counter rollsover to address 0000h allowing the read cycle to becontinued indefinitely. The read operation is terminatedby raising the CS pin (Figure 3-1).

3.3 Write SequencePrior to any attempt to write data to the 25XX640 arrayor STATUS register, the write enable latch must be setby issuing the WREN instruction (Figure 3-4). This isdone by setting CS low and then clocking out theproper instruction into the 25XX640. After all eight bitsof the instruction are transmitted, the CS must bebrought high to set the write enable latch. If the writeoperation is initiated immediately after the WRENinstruction without CS being brought high, the data willnot be written to the array because the write enablelatch will not have been properly set.

Once the write enable latch is set, the user mayproceed by setting the CS low, issuing a WRITEinstruction, followed by the address, and then the datato be written. Up to 32 bytes of data can be sent to the25XX640 before a write cycle is necessary. The onlyrestriction is that all of the bytes must reside in thesame page. A page address begins with XXX0 0000and ends with XXX1 1111. If the internal addresscounter reaches XXX1 1111 and the clock continues,the counter will roll back to the first address of the pageand overwrite any data in the page that may have beenwritten.

For the data to be actually written to the array, the CSmust be brought high after the Least Significant bit (D0)of the nth data byte has been clocked in. If CS isbrought high at any other time, the write operation willnot be completed. Refer to Figure 3-2 and Figure 3-3for more detailed illustrations on the byte writesequence and the page write sequence, respectively.While the write is in progress, the STATUS register maybe read to check the status of the WPEN, WIP, WEL,BP1, and BP0 bits (Figure 3-6). A read attempt of amemory array location will not be possible during awrite cycle. When the write cycle is completed, thewrite enable latch is reset.

TABLE 3-1: INSTRUCTION SET

Instruction Name Instruction Format Description

READ 0000 0011 Read data from memory array beginning at selected addressWRITE 0000 0010 Write data to memory array beginning at selected addressWREN 0000 0110 Set the write enable latch (enable write operations)WRDI 0000 0100 Reset the write enable latch (disable write operations)RDSR 0000 0101 Read STATUS registerWRSR 0000 0001 Write STATUS register


25AA640/25LC640
FIGURE 3-1: READ SEQUENCE
FIGURE 3-2: BYTE WRITE SEQUENCE

FIGURE 3-3: PAGE WRITE SEQUENCE

SO

SI

SCK

CS

0 2 3 4 5 6 7 8 9 10 11 21 22 23 24 25 26 27 28 29 30 311

0 100000 1 15 14 13 12 2 1 0

7 6 5 4 3 2 1 0

Instruction 16-bit Address

Data OutHigh-Impedance

SO

SI

CS

0 000000 1 15 14 13 12 2 1 0 7 6 5 4 3 2 1 0Instruction 16-bit Address Data Byte

High-Impedance

Twc

SI

CS

9 10 11 21 22 23 24 25 26 27 28 29 30 31

0 000000 1 15 14 13 12 2 1 0 7 6 5 4 3 2 1 0

Instruction 16-bit Address Data Byte 1

SCK0 2 3 4 5 6 71 8

SI

CS

41 42 43 46 47

7 6 5 4 3 2 1 0Data Byte n (32 max)

SCK32 34 35 36 37 38 3933 40

7 6 5 4 3 2 1 0Data Byte 3

7 6 5 4 3 2 1 0Data Byte 2

44 45


25AA640/25LC640
3.4 Write Enable (WREN) and
Write Disable (WRDI)The 25XX640 contains a write enable latch. SeeTable 3-3 for the Write-Protect Functionality Matrix.This latch must be set before any write operation will becompleted internally. The WREN instruction will set thelatch, and the WRDI will reset the latch.

The following is a list of conditions under which thewrite enable latch will be reset:

• Power-up• WRDI instruction successfully executed• WRSR instruction successfully executed• WRITE instruction successfully executed

FIGURE 3-4: WRITE ENABLE SEQUENCE

FIGURE 3-5: WRITE DISABLE SEQUENCE

SCK

0 2 3 4 5 6 71

SI

High-ImpedanceSO

CS

0 10 0 0 0 01

SCK

0 2 3 4 5 6 71

SI

High-ImpedanceSO

CS

0 10 0 0 0 010


25AA640/25LC640
3.5 Read Status Register Instruction
(RDSR)The Read Status Register instruction (RDSR) providesaccess to the STATUS register. The STATUS registermay be read at any time, even during a write cycle. TheSTATUS register is formatted as follows:

The Write-In-Process (WIP) bit indicates whether the25XX640 is busy with a write operation. When set to a‘1’, a write is in progress, when set to a ‘0’, no write isin progress. This bit is read-only.

The Write Enable Latch (WEL) bit indicates the statusof the write enable latch. When set to a ‘1’, the latchallows writes to the array and STATUS register, whenset to a ‘0’, the latch prohibits writes to the array andSTATUS register. The state of this bit can always beupdated via the WREN or WRDI commands regardlessof the state of write protection on the STATUS register.This bit is read-only.

The Block Protection (BP0 and BP1) bits indicatewhich blocks are currently write-protected. These bitsare set by the user issuing the WRSR instruction. Thesebits are nonvolatile.

See Figure 3-6 for RDSR timing sequence.

FIGURE 3-6: READ STATUS REGISTER TIMING SEQUENCE

7 6 5 4 3 2 1 0WPEN X X X BP1 BP0 WEL WIP

SO

SI

CS

9 10 11 12 13 14 15

1 100000 0

7 6 5 4 2 1 0

Instruction

Data from STATUS RegisterHigh-Impedance

SCK

0 2 3 4 5 6 71 8

3


25AA640/25LC640
3.6 Write Status Register Instruction
(WRSR)The Write Status Register instruction (WRSR) allows theuser to select one of four levels of protection for thearray by writing to the appropriate bits in the STATUSregister. The array is divided up into four segments.The user has the ability to write-protect none, one, two,or all four of the segments of the array. The partitioningis controlled as shown in Table 3-2.

The Write-Protect Enable (WPEN) bit is a nonvolatilebit that is available as an enable bit for the WP pin. TheWrite-Protect (WP) pin and the Write-Protect Enable(WPEN) bit in the STATUS register control the pro-grammable hardware write-protect feature. Hardwarewrite protection is enabled when the WP pin is low andthe WPEN bit is high. Hardware write protection is dis-abled when either the WP pin is high or the WPEN bitis low. When the chip is hardware write-protected, onlywrites to nonvolatile bits in the STATUS register are dis-abled. See Table 3-3 for a matrix of functionality on theWPEN bit.

See Figure 3-7 for WRSR timing sequence.

TABLE 3-2: ARRAY PROTECTION

FIGURE 3-7: WRITE STATUS REGISTER TIMING SEQUENCE

BP1 BP0 Array AddressesWrite-Protected

0 0 none0 1 upper 1/4

(1800h-1FFFh)1 0 upper 1/2

(1000h-1FFFh)1 1 all

(0000h-1FFFh)

SO

SI

CS

9 10 11 12 13 14 15

0 100000 0 7 6 5 4 2 1 0

Instruction Data to STATUS Register

High-Impedance

SCK

0 2 3 4 5 6 71 8

3


25AA640/25LC640
3.7 Data ProtectionThe following protection has been implemented toprevent inadvertent writes to the array:
• The write enable latch is reset on power-up• A write enable instruction must be issued to set

the write enable latch• After a byte write, page write, or STATUS register

write, the write enable latch is reset• CS must be set high after the proper number of

clock cycles to start an internal write cycle• Access to the array during an internal write cycle

is ignored and programming is continued

3.8 Power-On-StateThe 25XX640 powers on in the following state:

• The device is in low-power Standby mode (CS =1)

• The write enable latch is reset• SO is in high-impedance state• A high-to-low transition on CS is required to enter

the active state

.

TABLE 3-3: WRITE-PROTECT FUNCTIONALITY MATRIX

WPEN WP WEL Protected Blocks Unprotected Blocks STATUS Register

X X 0 Protected Protected Protected

0 X 1 Protected Writable Writable

1 Low 1 Protected Writable Protected

X High 1 Protected Writable Writable


25AA640/25LC640

4.0 PACKAGING INFORMATION

4.1 Package Marking Information

* Standard marking consists of Microchip part number, year code, week code, traceability code (facilitycode, mask rev#, and assembly code). For marking beyond this, certain price adders apply. Pleasecheck with your Microchip Sales Office.

XXXXXXXXXXXXXNNN

YYWW

8-Lead PDIP (300 mil) Example:

8-Lead SOIC (150 mil) Example:

XXXXXXXXXXXXYYWW

NNN

25LC640/P017

0410

25LC640I/SN0410

017

8-Lead TSSOP Example:

XXXXYYWWNNN

5LCX0410017

Legend: XX...X Customer-specific informationY Year code (last digit of calendar year)YY Year code (last 2 digits of calendar year)WW Week code (week of January 1 is week ‘01’)NNN Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn)* This package is Pb-free. The Pb-free JEDEC designator ( )

can be found on the outer packaging for this package.

Note: In the event the full Microchip part number cannot be marked on one line, it willbe carried over to the next line, thus limiting the number of availablecharacters for customer-specific information.

3e

3e


25AA640/25LC640

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25AA640/25LC640

APPENDIX A: REVISION HISTORY

Revision FCorrections to Section 1.0, Electrical Characteristics.

Revision GProduct ID System, Example C: Corrected partnumber, added “Alternate Pinout” and corrected partnumber in Header.Updated Trademark and Sales List pages.

Revision H (June 2008)Added “Not Recommended” note; Updated Packaging;General updates.


25AA640/25LC640

THE MICROCHIP WEB SITEMicrochip provides online support via our WWW site atwww.microchip.com. This web site is used as a meansto make files and information easily available tocustomers. Accessible by using your favorite Internetbrowser, the web site contains the followinginformation:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software

• General Technical Support – Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing

• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER CHANGE NOTIFICATION SERVICEMicrochip’s customer notification service helps keepcustomers current on Microchip products. Subscriberswill receive e-mail notification whenever there arechanges, updates, revisions or errata related to aspecified product family or development tool of interest.

To register, access the Microchip web site atwww.microchip.com, click on Customer ChangeNotification and follow the registration instructions.

CUSTOMER SUPPORTUsers of Microchip products can receive assistancethrough several channels:

• Distributor or Representative• Local Sales Office• Field Application Engineer (FAE)• Technical Support• Development Systems Information Line

Customers should contact their distributor,representative or field application engineer (FAE) forsupport. Local sales offices are also available to helpcustomers. A listing of sales offices and locations isincluded in the back of this document.

Technical support is available through the web siteat: http://support.microchip.com


25AA640/25LC640

READER RESPONSEIt is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentationcan better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.

Please list the following information, and use this outline to provide us with your comments about this document.

To: Technical Publications Manager

RE: Reader ResponseTotal Pages Sent ________

From: Name

CompanyAddressCity / State / ZIP / Country

Telephone: (_______) _________ - _________

Application (optional):

Would you like a reply? Y N

Device: Literature Number:

Questions:

FAX: (______) _________ - _________

DS21223H25AA640/25LC640

1. What are the best features of this document?

2. How does this document meet your hardware and software development needs?

3. Do you find the organization of this document easy to follow? If not, why?

4. What additions to the document do you think would enhance the structure and subject?

5. What deletions from the document could be made without affecting the overall usefulness?

6. Is there any incorrect or misleading information (what and where)?

7. How would you improve this document?


25AA640/25LC640

PRODUCT IDENTIFICATION SYSTEMTo order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO. X /XX XXX

PatternPackageTemperatureRange

Device

Device 25AA640: 64K bit 1.8V SPI Serial EEPROM

25AA640T: 64K bit 1.8V SPI Serial EEPROM(Tape and Reel)

25AA640X: 64K bit 1.8V SPI Serial EEPROMin alternate pinout (ST only)

25AA640XT: 64K bit 1.8V SPI Serial EEPROMin alternate pinout Tape and Reel (ST only)

25LC640: 64K bit 2.5V SPI Serial EEPROM25LC640T: 64K bit 2.5V SPI Serial EEPROM

(Tape and Reel)25LC640X: 64K bit 2.5V SPI Serial EEPROM

in alternate pinout (ST only)25LC640XT: 64K bit 2.5V SPI Serial EEPROM

in alternate pinout Tape and Reel (ST only)

Temperature Range I = -40°C to +85°CE = -40°C to +125°C

Package P = Plastic DIP (300 mil Body), 8-leadSN = Plastic SOIC (150 mil Body), 8-leadST = Plastic TSSOP (4.4 mm Body), 8-lead

Examples:

a) 25AA640-I/SN: Industrial Temp.,SOIC package

b) 25AA640T-I/SN: Tape and Reel,Industrial Temp., SOIC package

c) 25AA640X-I/ST: Alternate PinoutIndustrial Temp., TSSOP package

d) 25LC640-I/SN: Industrial Temp.,SOIC package

e) 25LC640T-I/SN: Tape and Reel,Industrial Temp., SOIC package

f) 25LC640X-I/ST: Alternate Pinout,Industrial Temp., TSSOP package


25AA640/25LC640
NOTES:

Note the following details of the code protection feature on Microchip devices:• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of ourproducts. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such actsallow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding deviceapplications and the like is provided only for your convenienceand may be superseded by updates. It is your responsibility toensure that your application meets with your specifications.MICROCHIP MAKES NO REPRESENTATIONS ORWARRANTIES OF ANY KIND WHETHER EXPRESS ORIMPLIED, WRITTEN OR ORAL, STATUTORY OROTHERWISE, RELATED TO THE INFORMATION,INCLUDING BUT NOT LIMITED TO ITS CONDITION,QUALITY, PERFORMANCE, MERCHANTABILITY ORFITNESS FOR PURPOSE. Microchip disclaims all liabilityarising from this information and its use. Use of Microchipdevices in life support and/or safety applications is entirely atthe buyer’s risk, and the buyer agrees to defend, indemnify andhold harmless Microchip from any and all damages, claims,suits, or expenses resulting from such use. No licenses areconveyed, implicitly or otherwise, under any Microchipintellectual property rights.

© 2008 Microchip Technology Inc.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, rfPIC and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

FilterLab, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM, PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

© 2008, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.

Printed on recycled paper.

DS21223H-page 23

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.


AMERICASCorporate Office2355 West Chandler Blvd.Chandler, AZ 85224-6199Tel: 480-792-7200 Fax: 480-792-7277Technical Support: http://support.microchip.comWeb Address: www.microchip.comAtlantaDuluth, GA Tel: 678-957-9614 Fax: 678-957-1455BostonWestborough, MA Tel: 774-760-0087 Fax: 774-760-0088ChicagoItasca, IL Tel: 630-285-0071 Fax: 630-285-0075DallasAddison, TX Tel: 972-818-7423 Fax: 972-818-2924DetroitFarmington Hills, MI Tel: 248-538-2250Fax: 248-538-2260KokomoKokomo, IN Tel: 765-864-8360Fax: 765-864-8387Los AngelesMission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608Santa ClaraSanta Clara, CA Tel: 408-961-6444Fax: 408-961-6445TorontoMississauga, Ontario, CanadaTel: 905-673-0699 Fax: 905-673-6509

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EUROPEAustria - WelsTel: 43-7242-2244-39Fax: 43-7242-2244-393Denmark - CopenhagenTel: 45-4450-2828 Fax: 45-4485-2829France - ParisTel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79Germany - MunichTel: 49-89-627-144-0 Fax: 49-89-627-144-44Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781Netherlands - DrunenTel: 31-416-690399 Fax: 31-416-690340Spain - MadridTel: 34-91-708-08-90Fax: 34-91-708-08-91UK - WokinghamTel: 44-118-921-5869Fax: 44-118-921-5820

WORLDWIDE SALES AND SERVICE

01/02/08

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